VoNR Call Flow for UPF

This section describes the steps for VoNR session and respective PDR Creation on UPF.
VoNR Call Flow
VoNR Call Flow
StepDescription

1

UE1 and UE2 are registered on 5G network. They establish the IMS PDU session and both are registered with same IMS. Both UEs are in connected mode.

2

For IMS signaling, a non-GBR QoS PDRs (UL and DL) is created by SMF which has the QFI value that corresponds to 5QI value 5.

3

Similarly, for Conversational Voice traffic, the PDRs for GBR QoS flow is created with the QFI value that corresponds to 5QI value 1.

4

The QFI to 5QI mapping is maintained by SMF, hence the QFI does not have the values same as 5QI.

5

The above steps are valid for both Mobile Originated (MO) or Mobile Terminate (MT) call flows.

6

Refer to 3GPP TS 23.501, Section 5.7.4 for other types of 5QI mappings for GBR or Non-GBR flows.